Back-pedaling brake.



Patented Ian. l4, I902.

No. 69l,l47.

R. M. KEATING.

BACK PEDALING BRAKE.

(Application flled'sept. 13, 1897.)

(No Model.)

m: nonms PETERS w. FNOTO-UTHQ. wnsHmsTGm n. c,

' UNITED STATES ROBERT M. KEATING, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO THE R. M. KEATING MOTOR COMPANY, OF PORTLAND, MAINE, A CORPORA- TION OF MAIN E.

BACK-PEDALING BRAKE.

SPECIFICATION formingpart of Letters Patent N0. 691,14'7, dated January 14, 1902.

Application filed September 13, 1897. Serial No. 651,450. (No model.)

To all whom it may concern.-

Be it known that I, ROBERT M. KEATING, a citizen of the United States of America, residing in Springfield, in the county of I-Iampden and State of Massachusetts, have invented new and useful Improvements in Back-Pedal Brake Mechanism, of which the following is a specification, reference being had to the accompanying drawings and letters of reference marked thereon.

In the drawings, like letters of reference indicating like parts, Figure 1 is an isometric perspective of one end of a wheel-hub. Fig. 2 is a like view of an eccentric split ring to be mounted thereon. Fig. 3 is a side view of the sprocket-wheel. Fig. 4 is an isometric perspective of a shell adapted to set over the end of the hub. Fig. 5 is a sectional View of the same. Fig. 6 is an end view of the hub and brake mechanism in section, the sprocketwheel being shown in full lines mounted thereon, it being located back of the plane on which the section is taken. Fig. 7 is an end view of the hub. Fig. 8 is an end view of the hub with the brake-ring mounted thereon, the ring being located in a position to allow the free revolution of the hub; and Fig. 9 is a like view of the hub with the brakering mounted thereon, the ring being in position to produce the necessary binding or frictional effect and to restrain the revolution of the hub.

In detail, a indicates the hub; b, eccentricshaped end portion thereof; a, an elevation or raisedpart concentric with the axial line of the hub; d, ashoulder; e,an eccentric split ring; f, alateral lug on the same; 9, a sprocket-wheel; h, a recess therein; z', a cap; j, annular flange, and is lateral projections.

The construction and operation of my device are as follows: The sprocket-wheel is of course mounted upon the hub and revolves with it. The means of locking the hub and sprocket wheel, however, together differs materially from that heretofore employed in that instead of the sprocket-wheel being attached directly to the hubitis mounted upon the part c of the hub and is restrained from rotating thereon by reason of its engagement with the lug f, projecting laterally from the eccentric split ring e, which lug enters the recess 71. in the sprocket-wheel, so that the sprocket-wheel is free to revolve upon the hub .to the extent permitted by the movement of the ring 6 upon the hub, and the movement of the ring 6 upon the hub is limited by the walls Z and m of the recess between them. The portion 0 of the hub is concentric with its axial line, and the sprocketavheel is mounted thereon. The portion 1) of the hub upon which the split ring is mounted is eccentric with the axial line of the hub, and the split ring is eccentric also, but in reverse direction to the surface 2), so that when the split ring is in position, as shown in Figs. 6 and 8, the exterior surface of the split ring is substantially a true circle, except as to the portion cut therefrom, and is of a diameter to just fit within and clear the inner Wall of the flange of the cap 1'. When, however, the split ring is moved to the position shown in Fig. 9, it is expandcd by reason of its riding upon the eccentric surface upon which it is mounted, and thus the outer surface or periphery of the split ring is forced against the inner wall of the flange j of the capt' and friction thereby produced between the periphery of the split ring and the inner wall of said flange, thus checking the rotation of the hub and operating as a brake. The cap 1; is of course restrained from rotation, and by preference this is produced by providing it with projecting parts 7a, which are suitably fastened to the frame. It will now be seen that if the brake mechanism be set and the sprocket-wheel rotated in the direction indicated by the arrow 0 it will by reason of its engagement with the lug f first move the split ring to the position indicated in Figs. 6 and 8, or, in other words, move it to a position where it contracts to its smallest diameter, thus releasing it from frictional engagement with the cap-flange and permitting free rotation of the sprocket-wheel. When, however, back-pedaling is commenced, thus rotating the sprocket-wheel in the opposite direction, it results in first moving the split ring in a direction which will cause it to expand and bear with its periphery against the inner wall of the annular flange f, thus applying the requisite friction to effectually prevent rotation of the wheel. It will also be seen that the extent of friction or brake action applied may be readily regulated by the rider by a movement of the pedals in the requisite direction, so as to set the brake-ring in the desired position.

Having, therefore, described my invention, What I claim, and desire to secure by Letters Patent, is-

1. The combination of a hub provided with an eccentric exterior portion and a concentric portion, a sprocket-Wheel mounted on said concentric portion, an eccentric split ring mounted in reverse direction on said eccentric portion and arranged to engage the sprocket-Wheel, and a surface adapted to be engaged by said ring when expanded, substantially as set forth.

2. The combination of the hub a haxing eccentric circumferential portion 1), and concentric circumferential portion 0, and recess.

between the walls Z and m; a sprocket-Wheel having a recess h, mounted upon the concentric circumferential portion 0, eccentric split ring e having alugfand mounted upon the eccentric circumferential portion 1) with the lug resting in said recess, and a cap i, having flange 7' arranged with the flange closely adjacent to the circumference of the split ring, substantially as shown.

3. In a brake mechanism, a rotating part provided with an eccentric circumferential surface, an eccentric split ring mounted in reverse direction thereon, a fixed surface for the ring to bear against when expanded, and means to rotate said ring on the eccentric surface whereby the same is expanded, sub stantially as set forth.

4. In a brake mechanism, the combination of ahub, a ring mounted thereon, an inclined surface between the ring and hub adapted to cause the former to expand when moved in one direction, a fixed friction-surface for the ring to bear against, and positive means to cause movement between the movable parts, substantially as set forth.

ROBERT M. KEATING.

Witnesses:

S. SWEENEY, ALLEN WEBSTER. 

